Used in X-rays
Long metal shaft inside a glass tube which ends inside a large, circular glass chamber. Two small, glass extensions from the large, circular glass chamber. The glass tube continues through the top of the large, circular glass chamber. Inscription" TUNGSTEN TARGET MADE IN BOSTON BY MACALASTER, WIGGIN CO. Pat. 594036.
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“X-Ray tube,” Digital Collections - University at Buffalo Libraries, accessed November 25, 2020, https://digital.lib.buffalo.edu/items/show/16866.